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hush: make set -x support optional

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2010-07-16 12:36:14 +02:00
parent 3f5fae0772
commit 202a2d1219
5 changed files with 147 additions and 127 deletions
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155
shell/hush.c
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@@ -101,6 +101,136 @@
# define PIPE_BUF 4096 /* amount of buffering in a pipe */
#endif
//applet:IF_HUSH(APPLET(hush, _BB_DIR_BIN, _BB_SUID_DROP))
//applet:IF_MSH(APPLET(msh, _BB_DIR_BIN, _BB_SUID_DROP))
//applet:IF_LASH(APPLET(lash, _BB_DIR_BIN, _BB_SUID_DROP))
//applet:IF_FEATURE_SH_IS_HUSH(APPLET_ODDNAME(sh, hush, _BB_DIR_BIN, _BB_SUID_DROP, sh))
//applet:IF_FEATURE_BASH_IS_HUSH(APPLET_ODDNAME(bash, hush, _BB_DIR_BIN, _BB_SUID_DROP, bash))
//kbuild:lib-$(CONFIG_HUSH) += hush.o match.o shell_common.o
//kbuild:lib-$(CONFIG_HUSH_RANDOM_SUPPORT) += random.o
//config:config HUSH
//config: bool "hush"
//config: default y
//config: help
//config: hush is a small shell (22k). It handles the normal flow control
//config: constructs such as if/then/elif/else/fi, for/in/do/done, while loops,
//config: case/esac. Redirections, here documents, $((arithmetic))
//config: and functions are supported.
//config:
//config: It will compile and work on no-mmu systems.
//config:
//config: It does not handle select, aliases, brace expansion,
//config: tilde expansion, &>file and >&file redirection of stdout+stderr.
//config:
//config:config HUSH_BASH_COMPAT
//config: bool "bash-compatible extensions"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable bash-compatible extensions.
//config:
//config:config HUSH_HELP
//config: bool "help builtin"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable help builtin in hush. Code size + ~1 kbyte.
//config:
//config:config HUSH_INTERACTIVE
//config: bool "Interactive mode"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable interactive mode (prompt and command editing).
//config: Without this, hush simply reads and executes commands
//config: from stdin just like a shell script from a file.
//config: No prompt, no PS1/PS2 magic shell variables.
//config:
//config:config HUSH_JOB
//config: bool "Job control"
//config: default y
//config: depends on HUSH_INTERACTIVE
//config: help
//config: Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
//config: command (not entire shell), fg/bg builtins work. Without this option,
//config: "cmd &" still works by simply spawning a process and immediately
//config: prompting for next command (or executing next command in a script),
//config: but no separate process group is formed.
//config:
//config:config HUSH_TICK
//config: bool "Process substitution"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable process substitution `command` and $(command) in hush.
//config:
//config:config HUSH_IF
//config: bool "Support if/then/elif/else/fi"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable if/then/elif/else/fi in hush.
//config:
//config:config HUSH_LOOPS
//config: bool "Support for, while and until loops"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable for, while and until loops in hush.
//config:
//config:config HUSH_CASE
//config: bool "Support case ... esac statement"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable case ... esac statement in hush. +400 bytes.
//config:
//config:config HUSH_FUNCTIONS
//config: bool "Support funcname() { commands; } syntax"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable support for shell functions in hush. +800 bytes.
//config:
//config:config HUSH_LOCAL
//config: bool "Support local builtin"
//config: default y
//config: depends on HUSH_FUNCTIONS
//config: help
//config: Enable support for local variables in functions.
//config:
//config:config HUSH_RANDOM_SUPPORT
//config: bool "Pseudorandom generator and $RANDOM variable"
//config: default y
//config: depends on HUSH
//config: help
//config: Enable pseudorandom generator and dynamic variable "$RANDOM".
//config: Each read of "$RANDOM" will generate a new pseudorandom value.
//config:
//config:config HUSH_EXPORT_N
//config: bool "Support 'export -n' option"
//config: default y
//config: depends on HUSH
//config: help
//config: export -n unexports variables. It is a bash extension.
//config:
//config:config HUSH_MODE_X
//config: bool "Support 'hush -x' option and 'set -x' command"
//config: default y
//config: depends on HUSH
//config: help
//config: This instructs hush to print commands before execution. Adds ~300 bytes.
//config:
//usage:#define hush_trivial_usage NOUSAGE_STR
//usage:#define hush_full_usage ""
//usage:#define lash_trivial_usage NOUSAGE_STR
//usage:#define lash_full_usage ""
//usage:#define msh_trivial_usage NOUSAGE_STR
//usage:#define msh_full_usage ""
/* Build knobs */
#define LEAK_HUNTING 0
@@ -531,8 +661,13 @@ struct globals {
*/
smallint flag_return_in_progress;
#endif
smallint fake_mode;
smallint n_mode;
#if ENABLE_HUSH_MODE_X
smallint x_mode;
# define G_x_mode G.x_mode
#else
# define G_x_mode 0
#endif
smallint exiting; /* used to prevent EXIT trap recursion */
/* These four support $?, $#, and $1 */
smalluint last_exitcode;
@@ -3693,9 +3828,10 @@ static void execvp_or_die(char **argv)
_exit(127); /* bash compat */
}
#if ENABLE_HUSH_MODE_X
static void dump_cmd_in_x_mode(char **argv)
{
if (G.x_mode && argv) {
if (G_x_mode && argv) {
/* We want to output the line in one write op */
char *buf, *p;
int len;
@@ -3717,6 +3853,9 @@ static void dump_cmd_in_x_mode(char **argv)
free(buf);
}
}
#else
# define dump_cmd_in_x_mode(argv) ((void)0)
#endif
#if BB_MMU
#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
@@ -4267,18 +4406,18 @@ static NOINLINE int run_pipe(struct pipe *pi)
rcode = setup_redirects(command, squirrel);
restore_redirects(squirrel);
/* Set shell variables */
if (G.x_mode)
if (G_x_mode)
bb_putchar_stderr('+');
while (*argv) {
p = expand_string_to_string(*argv);
if (G.x_mode)
if (G_x_mode)
fprintf(stderr, " %s", p);
debug_printf_exec("set shell var:'%s'->'%s'\n",
*argv, p);
set_local_var(p, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
argv++;
}
if (G.x_mode)
if (G_x_mode)
bb_putchar_stderr('\n');
/* Redirect error sets $? to 1. Otherwise,
* if evaluating assignment value set $?, retain it.
@@ -4943,7 +5082,7 @@ static int run_and_free_list(struct pipe *pi)
{
int rcode = 0;
debug_printf_exec("run_and_free_list entered\n");
if (!G.fake_mode) {
if (!G.n_mode) {
debug_printf_exec(": run_list: 1st pipe with %d cmds\n", pi->num_cmds);
rcode = run_list(pi);
}
@@ -6969,8 +7108,8 @@ static int set_mode(const char cstate, const char mode)
{
int state = (cstate == '-' ? 1 : 0);
switch (mode) {
case 'n': G.fake_mode = state; break;
case 'x': G.x_mode = state; break;
case 'n': G.n_mode = state; break;
case 'x': IF_HUSH_MODE_X(G_x_mode = state;) break;
default: return EXIT_FAILURE;
}
return EXIT_SUCCESS;